184 citations · 789 across the 16 of their papers we have counts for
13 papers · 1 filter
On Black Hole Mass Estimation from X-ray Spectra of Ultraluminous X-ray Sources
Kiki Vierdayanti, Ken-ya Watarai, Shin Mineshige
We propose a methodology to derive a black-hole mass for super-critical accretion flow. Here, we use the extended disk blackbody (extended DBB) model, a fitting model in which the…
Eclipsing light curves for accretion flows around a rotating black hole and atmospheric effects of the companion star
Rohta Takahashi, Ken-Ya Watarai
We calculate eclipsing light curves for accretion flows around a rotating black hole taking into account the atmospheric effects of the companion star. In the cases of no atmospher…
New Analytical Formulae for Optically-Thin Accretion Flows
Ken-ya Watarai
In a previous paper, we described new analytic formulae for optically-thick supercritical accretion flows (Watarai 2006, hereafter paper 1). Here we present analytic formulae for o…
New Analytical Formula for Supercritical Accretion Flows
K. Watarai
We examine a new family of global analytic solutions for optically thick accretion disks, which includes the supercritical accretion regime. We found that the ratio of the advectio…
Eclipsing Light-Curve Asymmetry for Black-Hole Accretion Flows
Ken-ya Watarai, Rohta Takahashi, Jun Fukue
We propose an eclipsing light-curve diagnosis for black-hole accretion flows. When emission from an inner accretion disk around a black hole is occulted by a companion star, the ob…
Geometrical Effect of Supercritical Accretion Flows: Observational Implications of Galactic Black-Hole Candidates and Ultraluminous X-ray Sources
K. Watarai, K. Ohsuga, R. Takahashi +1
We investigate the dependence of the viewing angle in supercritical accretion flows and discuss the observational implications of galactic black-hole candidates and ultraluminous X…